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The C++ language contains some statements and not any built in function. Hence the actual function is written in the language provided any method of performing I/O operation. The header file is a file containing C++ declaration and macro definition to be shared between several source files. In computer science a library is a collection of subprograms used to develop software.
Note: Header files are used for two purposes:
  1. System header files declare the interfaces to parts of the operating system.
  2. Our own headers files contain declarations for interfaces between the source files of the program.

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